Fig. 4From: Comparison of the total and hidden blood loss in patients undergoing single-level open and unilateral biportal endoscopic transforaminal lumbar interbody fusion: a retrospective case control studyThe composition of total blood loss in 2 groups. Open transforaminal lumbar interbody fusion, O-TLIF; Unilateral biportal endoscopic transforaminal lumbar interbody fusion, ULIF; Intraoperative blood loss, IBL; Hidden blood loss, HBLBack to article page